3-30-10
WHEN YOU LIFT THE AIRPLANE WITH PNEUMATIC BAGS Page 3-92 Jul 01/2005
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757
AIRPLANE RECOVERY DOCUMENT
Figure 3-49 PNEUMATIC BAG LOCATIONS

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3-30-11 When You Use Filler Material for Support (Contour Line)
1.  
Use filler material (foam) if it is necessary to give better support between the bags and the airplane. This permits the bag system to follow the shape of the airplane and to have a more stable condition. This is very important while you lift the airplane. The filler material is only permitted above the bag areas shown in Figure 3-50.

2.  
There are two different types of filler systems (foam) available to lift the airplane:

A.  The first type is a blown (polyurethane free-blown) system. You must make a wood perimeter around the top bags to contain the foam in the area above the bags. The clearance above the air bags must be a minimum of 6 inches (15 cm) before you use the foam.
B.  The second type uses a mixture of sodium silicate and isocyanate that you put into special glass fiber bags. The clearance above the air bags must be a minimum of 3 inches (7.6 cm) before you start.
NOTE:  BE CAREFUL WITH THE SPECIAL GLASS FIBER BAGS. YOU CAN USE THE BAGS MANY TIMES.

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3-30-12 When You Lift the Airplane With Movable Cranes
1.  General
A.  Large movable cranes with the correct slings are possibly the fastest procedure you can use to lift a damaged airplane. But the strength of the ground surface must be sufficient to hold the cranes.
B.  If you have a folded nose gear, a movable crane is the easiest equipment you can use. You can lift the forward fuselage in a one-step procedure (see Figure 3-51).
C.  You can use a three-point system to lift the airplane if the necessary structures are not damaged. You can go through the wings to the support beams of the main landing gear. Then you lift the airplane from two wing points and a sling on the forward fuselage. This is the three-point system (see Figure 3-52). This system prevents many of the problems you can have if you lift the airplane with jacks or bags.
2.  Prepare to Use Cranes and Slings
A.  Make sure that all the basic procedures in SECTION 3-20 of this Chapter are completed.
B.  Be very careful when you use a movable crane to prevent injury to persons and damage to equipment. We recommend these precautions:
C.  Use only persons (crane operators and hook tenders) who operate these cranes frequently.
D.  Each crane person must get only special signals. These signals only come from the crane hook person or from the control person for the full operation.
　
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